Improvement in scroll-sawing machines



B. MERRITT. Scroll-Sawing Machine.

No. 208,411. Patented Sept. 24, 1878.

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UNITED STATES PATENT OEEIoE.

BENJAMIN MERBITT, OF NEWTON, MASSACHUSETTS.

IMPROVEMENT IN SCROLL-SAWING MACHINES.

Specification forming part of Letters Patent No. 208,411, datedSeptember 24, 1878; application filed March 11, 1878.

To all whom/it may concern:

Be it known that I, BENJAMIN MERRITT, of Newton, in the county ofMiddlesex and State of Massachusetts, have invented certain new anduseful Improvements in Jig-Saws, of which the following is aspecification:

The nature of my invention consists in han ging a jig-saw blade upon twoparallel levers, said levers being hung upon independent swingingjoints, each lever being connected by a comparatively short link to therigid part of the frame, so that as the levers vibrate up and down theseshort links will so govern their motions that the saw itself will movein a straight line.

In the drawings, Figure 1 is a front elevation, a part of each of thesaw-holding levers being represented as broken out to show thegoverning-links. Fig. 2 is a rear elevation of the same. Fig. 3 is aplan, showing part of my device.

A D B B B Figs. 1 and 2, represent the frame of my machine, B being thesaw-table. H H are parallel levers hung by swinging links or joints 0 Oto the frame, as shown. K is the saw, wh ich is attached by any suitabledevice to the ends of the levers H H, K being a link for connecting theopposite ends of the said levers. In addition to the swinging links G (Jfor connecting the levers H H to the frame. I make an additionalconnection by means of the links E and E, the link E being pivoted tothe part B at e and to the lever H at 0, while the link E is connectedto the part B at e and to the lever H at 0 From the above it may be seenthat if a tilting motion be given to these levers H H, as it may be bythe link L and crank L, they will have a compound motionthat is, theywill be forced by the links E and E to move back and forth in thedirection of their length, the swinging links 0 and G, to which they areattached, admitting of this motion, and when all of the parts areproperly proportioned the resultant motion of the saw K will bepractically in a straight line.

In practice I have adopted the following proportions between the parts:The levers H H are three and one -half (3%) feet long, hung on theircenters, the swinging links or joints G 0 being each four (4) inches inlength, while the governing-links E and E are each ten and one-half(10%) inches in length. These proportions may be varied somewhat withoutvarying the practicable results.

M is a balance-beam, hung at C and connected to the crank-disk L at apoint diametrically opposite to the saw-driving crank L so that the beamM in its motion shall balance this his viva of the levers H H, and thusinsure steadiness to the machine.

I claim as my invention The combination of the saw K, the lovers H H,and the swinging links G (l with the governing-links E E, all operatingsubstantially as described, and for the purpose set forth.

BENJ. MERRITT.

Witnesses:

THOMAS Mum, A. HUN BERRY.

